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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '910737df957706e2653532ef10d2654ef9687ffe0b0f8257c98a0ce4e6eacbd3' 
  AND token = 'wQbWHzzlBSOoVb4T51rQEZDCy5mVlkYE511gBOlLe3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}